Toyota Tundra (2015 year). Manual - part 869

Last Modified: 9-16-2014

6.6 U

Doc ID: RM0000030AE00IX

Model Year: 2015

Model: Tundra

Prod Date Range: [08/2014 -           ]

Title: WF1AM TRANSFER: TOUCH SELECT 2-4 AND HIGH-LOW SYSTEM: SYSTEM DIAGRAM; 2015 MY Tundra

[08/2014 -        ]

SYSTEM DIAGRAM

WF1AM TRANSFER: TOUCH SELECT 2-4 AND HIGH-LOW SYS...

TRANSMITTING ECU

(TRANSMITTER)

RECEIVING ECU

SIGNAL

COMMUNICATION

METHOD

Skid control ECU

4 wheel drive

control ECU

Wheel speed sensor error

signal

Wheel speed signal

Vehicle wheel sensor power

supply decline status signal

Vehicle speed signal

CAN communication

system

WF1AM TRANSFER: TOUCH SELECT 2-4 AND HIGH-LOW SYS...

TRANSMITTING ECU

(TRANSMITTER)

RECEIVING ECU

SIGNAL

COMMUNICATION

METHOD

ECM

4 wheel drive

control ECU

Shift position P signal

Shift position N signal

CAN communication

system

4 wheel drive control

ECU

Combination meter

assembly

4WD indicator ON and

flashing request signal

L4 indicator ON and flashing

request signal

Buzzer sound demand signal

CAN communication

system

4 wheel drive control

ECU

Skid control ECU

Motor energizing signal

4WD status signal

L4 status signal

CAN communication

system

4 wheel drive control

ECU

ECM

Cruise control cancel request

signal

4WD status signal

CAN communication

system

WF1AM TRANSFER: TOUCH SELECT 2-4 AND HIGH-LOW SYS...

Last Modified: 9-16-2014

6.6 D

Doc ID: RM0000030AD00IX

Model Year: 2015

Model: Tundra

Prod Date Range: [08/2014 -           ]

Title: WF1AM TRANSFER: TOUCH SELECT 2-4 AND HIGH-LOW SYSTEM: SYSTEM DESCRIPTION; 2015 MY

Tundra [08/2014 -        ]

SYSTEM DESCRIPTION

1. DESCRIPTION

A part-time 2-speed WF1AM transfer uses a touch select 2-4 and high-low system, enabling the driver

to switch between 2WD, 4H and 4L modes by turning the transfer position switch.

Through these switch signals, the 4 wheel drive control ECU actuates the shift motor in the transfer

shift actuator and another shift motor in the A.D.D. actuator (differential vacuum actuator assembly).

2. DRIVING MODE SWITCHING PATTERN

Text in Illustration

*1

Transfer Position Switch

-

-

3. INDICATOR LIGHT AND WARNING BUZZER OPERATING CONDITIONS

MODE

4HI INDICATOR LIGHT 4LO INDICATOR LIGHT WARNING BUZZER

2WD

Not illuminated

Not illuminated

Not sounding

Switching from 2WD to 4H

Blinking

Not illuminated

Not sounding

2WD to 4L switch request (not permitted)

Blinking

Not illuminated

Sounding

4H

Illuminated

Not illuminated

Not sounding

Switching from 4H to 2WD

Blinking

Not illuminated

Not sounding

Switching from 4H to 4L

Illuminated

Blinking

Not sounding

4H to 4L switch request (not permitted)

Illuminated

Blinking

Sounding

WF1AM TRANSFER: TOUCH SELECT 2-4 AND HIGH-LOW SYS...